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Author Question: What is the residence time of oxygen in the Earth's atmosphere? A) 10 years B) 100 years C) 500 ... (Read 40 times)

jho37

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on: Jul 14, 2018
What is the residence time of oxygen in the Earth's atmosphere?
 
  A) 10 years
  B) 100 years
  C) 500 years
  D) 5000 years

Question 2

The heterosphere:
 
  A) lies below the homosphere.
  B) contains primarily heavy gases.
  C) is populated primarily by variable gases.
  D) is named for its chemical homogeneity.


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aliotak

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Reply #1 on: Jul 14, 2018
Answer to Question 1

Answer: D

Answer to Question 2

Answer: C


jho37

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Reply 2 on: Jul 14, 2018
:D TYSM

yeungji

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Reply 3 on: Yesterday
Gracias!

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